PeachParts Mercedes-Benz Forum - View Single Post - Picked up a 300,000+ mile '93 300D, have some questions.

jltcasper3 · #12 01-18-2010, 08:12 PM

Quote:

Originally Posted by atikovi

A short update. I went to where the car is parked to get it ready to drive the 30 miles home tomorrow and just to check under the hood again. I put in a freshly charged battery. The glow plug light doesn't seem to work so I just counted to five before cranking her up. Surprise surprise she started right up, just as if she was running yesterday! And the tach started to work again. Thats the good news.

The bad news is the engine is putting out quite a bit of smoke even after letting it warm up for 10 minutes. I didn't notice that when I bought the car. I hope I don't get pulled over by the police. Hopefully it will go away once it's fully warmed up. I looked closer for the puff puff sound and can see and feel with my hand, puffs of air coming from somewhere around the 3rd injector. Fuel is also leaking out around there as well. I'm not familiar with the anatomy of this engine but what do you make of this?

If u feel air around one of the injectors, i is most likley a precombustion chamber leak, yes u may get black fuely mixture blowing from it. To repair this u have to pull intake and then the glow glug and injector, then there are special tools to remove the locking ring and then to pull it out also. If the seats arn't damaged u can clean it and reinstall it and everything and it might be ok (my car is still running that way). If it's damaged, there is a cutting tool to repair the seats and then a shim to put the prechamber at the same hight in the cylinder.

Other things that cause a fuel leak around the injectors are the fuel leak off hoses between all the injectors. Just replace them with some new viton (biodiesel safe) hose.

For 300,000 miles, since u will most likley have the intake off for precahmber repair, i would replace all the glow plugs. Then u will want to fix the glow plug light problem, who knows what that might be. Also check timeing chain strech, if it's too far out, replace it. Have injectors pop tested and spray pattern checked, if bad replace the nozzels and have properly calibrated. Replace fuel filters if u havn't done that yet.